package com.xingyu.springbootlearn.config;

import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @Author 刘星宇
 * @Date 2020/10/5 15:00
 */
public class LoginHandlerInteceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //登陆成功之后，会存在用户的session
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null){
            request.setAttribute("msg","没有权限，请先登录！");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return true;
        }else
            return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
    }
}
